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package org.netbeans.api.javafx.source;

import java.util.logging.Level;
import java.util.logging.Logger;
import org.openide.util.Lookup;
import org.openide.util.LookupEvent;
import org.openide.util.LookupListener;
import org.openide.util.RequestProcessor;

/**
 *
 * @author Jan Lahoda
 */
final class JavaFXSourceTaskFactoryManager {

    // -J-Dorg.netbeans.api.javafx.source.JavaFXSourceTaskFactoryManager.level=FINEST
    private static final Logger LOG = Logger.getLogger(JavaFXSourceTaskFactoryManager.class.getName());
    
    private static JavaFXSourceTaskFactoryManager INSTANCE;
    
    public static synchronized void register() {
        INSTANCE = new JavaFXSourceTaskFactoryManager();
    }
    
    private Lookup.Result<JavaFXSourceTaskFactory> factories;
    
    /** Creates a new instance of JavaSourceTaskFactoryManager */
    private JavaFXSourceTaskFactoryManager() {
        final RequestProcessor.Task updateTask = new RequestProcessor("JavaFXSourceTaskFactoryManager Worker", 1).create(new Runnable() { // NOI18N
            public void run() {
                update();
            }
        });
        
        factories = Lookup.getDefault().lookupResult(JavaFXSourceTaskFactory.class);
        factories.addLookupListener(new LookupListener() {
            public void resultChanged(LookupEvent ev) {
                updateTask.schedule(0);
            }
        });
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("FX Tasks: " + factories.allInstances());
        }
        
        update();
    }
    
    private void update() {
        for (JavaFXSourceTaskFactory f : factories.allInstances()) {
            f.fileObjectsChanged();
        }
    }
}
